The Synthesis of Aminobenzothiazoles from 2,3-Biaryl-5-anilino-Δ<sup>3</sup>-1,2,4-thiadiazolines
作者:Kevin Pan、Allen B. Reitz
DOI:10.1081/scc-120021031
日期:2003.7
2-Amidinobenzothiazoles 4 can be prepared in high yields by a thermally-promoted rearrangement of thiadiazolium salts I or thiadiazolines 2. Addition of base to the rearrangement of the thiadiazolium salts can improve the yields by the prior conversion of the thiadiazolium salts to the corresponding thiadiazoline free bases. The rearrangement of the thiadiazolines may go through an electrophilic aromatic substitution or free radical pathway.